第1页共236页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第1页共236页第三章船舶电气与船舶安全1886Thestaringcurrentofana.c.motoris______theratedcurrent.交流电机的启动电流比额定电流大得多。A.thesameasB.muchlargerthanC.lessthanD.equals1887Ammeteristomeasurethe______安培表用来测量电流。A.currentB.voltageC.powerD.frequencyInamodemthree-phaseA.C.synchronousbrushesgenerator,theexcitationwindingisontherotor.Thatmeans______对于现代三相交流同步有刷的发电机，励磁线圈在转子上。意即转子上的线圈用于输入励磁电流。A.ThegeneratorneednotexcitationB.ThewindingontherotorisforinputtingexcitationcurrentC.TherearethreephasewindingsontherotorD.Thegeneratorhasbrushes1889Theovercurrentrelay______themotorcontactorwhenthemotorexceedsitsratedcurrent.当电动机超过额定电流时，过电流继电器将跳开。第2页共236页第1页共236页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第2页共236页A.connectsB.tripsC.foulsD.destructs1886B1887A1888B1889BThe______isameasureofthephasedifferencebetweenvoltageandcurrentandisexpectedasthecosineofphaseangle.功率因数可用来表示电压与电流之间的相位差，表达成相位角的余弦。A.powerB.efficiencyC.effectivepowerD.powerfactor1891Currentchangingindirectionandrisingandfallinginvalueis______方向、大小都变化的电流是交流电。A.A.C.B.D.C.C.generatorD.freshwatergenerator1892Theoperationofparallelingtwoalternatorsrequiresthevoltagestobe______andalsoinphase.两台交流发电机并联，需要电压相等，并且同相。A.zeroB.eliminatedC.differentD.equal1893The______,cagerotorinductionmotoristhefirstchoicemarinemotorinmostmodemshipsbecauseofitselectricalandmechanicalsimplicity.第3页共236页第2页共236页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第3页共236页现代船舶上使用的电机都是三相电机。A.singlephaseB.twophaseC.threephaseD.fourphase1894Thestar-deltastarterisaneffectivemethodof______voltagestartingofamotor.采用Y—△启动器是电饥低电压启动的最好方法。A.increasedB.reducedC.unchangedD.Noneoftheabove1890D1891A1892D1893C1894BWitha______loadthevoltageandcurrentareinphase.对于纯电阻负荷，电压和电流同相。A.purelyresistanceB.capacitiveC.inductiveD.Noneoftheabove1896Increasingthetemperatureofafuelwill______itsviscosity.提高燃油的温度将降低其粘度。A.increaseB.reduceC.keepD.Noneoftheaboveistrue.1897The______isusedtomeasurethevolumeofaliquidorgasthroughapipelinwithinanygivenperiodoftime.流量计用于测量在给定时间内，通过管子的液体或气体的体积。A.flowmeterB.viscometerC.micrometerD.feeler第4页共236页第3页共236页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第4页共236页1898"gaugepressure"means______“表压”即是“超过大气压的压力”。A.vacuumB."theexcessofpressureaboveatmosphere"C."figureonagauge"D.Anyoftheabove1899Amanometerisusedtomeasure_____压气计用来测量压力。A.pressureB.temperatureC.volumeD.specificgravity1900Theviscosityregulatorcontrolsthefueloiltemperature______provideoilatthecorrectviscosityforcombustion.粘度调节器通过控制燃汕的温度实现粘度的控制。A.inorderthatB.becauseofC.inordertoD.owingto1895A1896B1897A1898B1899A1900CAviscosityregulatorusedforanengineisusuallyprovidedinordertoforan______engineburningheavyfueloil.柴油机的粘度调节器能保持燃油粘度恒定。A.regulatethefuelsupplyB.maintainaconstantfuelviscosityatthefuelvalvesC.maintainefficientcoolingD.alterthefueldensity第5页共236页第4页共236页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第5页共236页1902Oilm...
